Use this in our RV and there was a power outage at the campsite on the 4th of July while camping. When my wife looked at the volt meter it said 30 volts so I immediately turned off the switch and grabbed the volt meter and then hooked it up to the breaker box which read 30 volts there too. I leave it on all the time and watch the tension as I drive by in the RV. Definitely recommend
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